PEM fuel cell cathode contamination in the presence of cobalt ion (Co2+)

Tipo de material: Texto

TextoSeries ; Electrochimica Acta, 55(29), p.5823-5830, 2010Trabajos contenidos:

Li, H
Gazzarri, J
Tsay, K
Wu, S
Wang, H
Zhang, J
Wessel, S
Wessel, S
Joos, N
Schrooten, J

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Resumen: This paper reports the effects of Co2+ contamination on PEM fuel cell performance as a function of Co2+ concentration and operating temperature. A significant drop in fuel cell voltage occurred when Co2+ was injected into the cathode air stream, and Co2+ contamination became more severe with decreasing temperature. To investigate in detail the mechanism of Co2+ poisoning, AC impedance was monitored before and during Co2+ injection, revealing that both charge transfer and mass transport related processes deteriorated significantly in the presence of Co2+, whereas membrane conductivity decreased to a lesser extent. Surface cyclic voltammetry and contact angle measurements further revealed changes in physical properties, such as active Pt surface area and hydrophilicity, furthering our understanding of the contamination process.

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This paper reports the effects of Co2+ contamination on PEM fuel cell performance as a function of Co2+ concentration and operating temperature. A significant drop in fuel cell voltage occurred when Co2+ was injected into the cathode air stream, and Co2+ contamination became more severe with decreasing temperature. To investigate in detail the mechanism of Co2+ poisoning, AC impedance was monitored before and during Co2+ injection, revealing that both charge transfer and mass transport related processes deteriorated significantly in the presence of Co2+, whereas membrane conductivity decreased to a lesser extent. Surface cyclic voltammetry and contact angle measurements further revealed changes in physical properties, such as active Pt surface area and hydrophilicity, furthering our understanding of the contamination process.

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